Calendar.



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CALENDAR.

Specification of Letters Patent.

Patented Feb. 2'7, 1917.

Application filed. May 27, 1916. Serial No. 100,429.

To all whom t may concern.' l

Be it known that I, THoMAs DE Loon, a citizen of the United States, residing at Detroit, in the county of "Wayne, in the State of Michigan, have invented certain new and useful Improvements in Calendars, of which the following is a specification.

The object of my invention is to produce a calendar for several months or a year which is more compact than any heretofore in use and which is composed of so few characters that it can be legibly printed in a small space, as on a lead pencil, penholder, ink-bottle cap or dater. I attain this object by so arranging the names of the months and week-days that not more than one month-day is required and no week-day is repeated for the different months like in calendars heretofore in use.

My inventionl is illustrated inthe accom-4 panying drawings, in which- Figure 1 shows a calendar for the year 1916. Fig. 2 is an abbreviated form of Fig'. 1. Fig. 3 shows a calendar for the last eight months of 1916. Y

In Fig. 1 the days of the week, arranged in the usual order, are shown in the first row and the months are arranged under them. Each month is placed under the week-day on which such monthsseventh day falls. For example, June 7th, 1916, falls on Wednesday, and hence June is placed under Wednesday. So also, September 7tl1and December 7th, v1916, fall on Thursdays and these months are therefore placed under Thursday. Similarly, each month is arranged under a particular weekday as determined by the month-day, or key-number, 7th, shown under Jun in Fig. 1. Since the 7th, 14th, 21st and 28th days of any. month are just one week apart, we know that June 14th is Wednesday if June 7th is Wednesday, or that October 21st and 28th are Saturdays if October 7th'is Saturday. By counting backward or forward from 7, 14, 21 or 28, the day of the week of any month-day can be readily determined.

To find out on what day of the week July 14, for example, falls, it is only necessary to refer to the calendar shown in Fig. 1. July is found under Friday, which means that July 7, 14, 2l and 28 fall on Friday. Therefore, July lliis Friday. In like manner, to

find December 25, we refer to December and find that December 21 falls on Thursday. Counting forward from Thursday, December 22 is Friday, 23 is Saturday, 24C is Sunday and December 25 is Monday. Likewise, to find Labor Day, we refer to September and find that September 7 is Thursday. Counting backward, September 6 is lVednesday, 5 is Tuesday, and September a is the first Monday in September, or Labor Day.

In Fig. 2, I show a calendar similar to the one vshown in Fig; `1. Each week-day and each monthis represented by a single character, except Friday, vfor which two letters are employed in order that three months may be represented under Fridayin two rows. -I use the numbers 1 to 9 inclusive, for the rst nine months of the year and O, N, andD for October, November and December, respectively.V In order to distinguish the months of 81 days from the others, I have underscored the former.

In Fig. 8 is shown a calendar especially adapted to be imprinted on perishable articles, like pencils. It comprises only sixteen characters written on two lines and covers a period of eight months, The year is omiti ted, since the current year is understood and the key-number is Yalso omitted, because it may be'mentioned in an accompanying eX- planation of the calendar.

I have chosen 7 as the key-number or month-day, but. it is evidentV that another number could be used, as, for example, 1. However, I regard 7 to be preferable because it is easier to remember the multiples of 7 than the multiples of 7 plus a constant, like 1, 8, 15, 22, and 29.

Having described my invention, the following is what I claim new therein and desire to secure by Letters Patent:

1. A calendar having a month-day, seven week-days arranged in regulary order and several months, each month being placed adjacent to the particular Aweek-'day on which said month-day of each monthvfalls.

2. A calendar having the seven week-days arranged in regular order and the months of the year, each month placed adjacent to a particular week-day as determined by a common monthday, substantially as de-v scribed.

Copies` of this patent may be obtained for ve'cents each; by addressing the Commissioner of Patents,

Washington, I). C.

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